High-fidelity spin entanglement using optimal control

Florian Dolde (), Ville Bergholm (), Ya Wang (), Ingmar Jakobi, Boris Naydenov, Sébastien Pezzagna, Jan Meijer, Fedor Jelezko, Philipp Neumann, Thomas Schulte-Herbrüggen, Jacob Biamonte and Jörg Wrachtrup
Additional contact information
Florian Dolde: 3rd Institute of Physics, University of Stuttgart, IQST and SCOPE, Pfaffenwaldring 57
Ville Bergholm: ISI Foundation, Via Alassio 11/c
Ya Wang: 3rd Institute of Physics, University of Stuttgart, IQST and SCOPE, Pfaffenwaldring 57
Ingmar Jakobi: 3rd Institute of Physics, University of Stuttgart, IQST and SCOPE, Pfaffenwaldring 57
Boris Naydenov: Institute for Quantum Optics and IQST, University of Ulm, Albert-Einstein-Allee 11
Sébastien Pezzagna: Institute for Experimental Physics II, Linnéstraße 5, University of Leipzig
Jan Meijer: Institute for Experimental Physics II, Linnéstraße 5, University of Leipzig
Fedor Jelezko: Institute for Quantum Optics and IQST, University of Ulm, Albert-Einstein-Allee 11
Philipp Neumann: 3rd Institute of Physics, University of Stuttgart, IQST and SCOPE, Pfaffenwaldring 57
Thomas Schulte-Herbrüggen: Technical University Munich
Jacob Biamonte: ISI Foundation, Via Alassio 11/c
Jörg Wrachtrup: 3rd Institute of Physics, University of Stuttgart, IQST and SCOPE, Pfaffenwaldring 57

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Precise control of quantum systems is of fundamental importance in quantum information processing, quantum metrology and high-resolution spectroscopy. When scaling up quantum registers, several challenges arise: individual addressing of qubits while suppressing cross-talk, entangling distant nodes and decoupling unwanted interactions. Here we experimentally demonstrate optimal control of a prototype spin qubit system consisting of two proximal nitrogen-vacancy centres in diamond. Using engineered microwave pulses, we demonstrate single electron spin operations with a fidelity F≈0.99. With additional dynamical decoupling techniques, we further realize high-quality, on-demand entangled states between two electron spins with F>0.82, mostly limited by the coherence time and imperfect initialization. Crosstalk in a crowded spectrum and unwanted dipolar couplings are simultaneously eliminated to a high extent. Finally, by high-fidelity entanglement swapping to nuclear spin quantum memory, we demonstrate nuclear spin entanglement over a length scale of 25 nm. This experiment underlines the importance of optimal control for scalable room temperature spin-based quantum information devices.

Date: 2014
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/ncomms4371 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4371

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms4371

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().